I have some old CD+G Karaoke discs. QMidi will play the audio tracks but no video, is there anyway I can get the video to play?

QMidi cannot currently display CDG graphics directly from CD+G disks. You need to "rip" your CD by using some third party software. This operation will extract your tracks as MP3+CDG files, which in turn will be played flawlessly by QMidi.

I just tried to put in my registration code to my new copy of QMidi and it says: "either the code is invalid or it doesn't match the name". Could you please help?

Starting from version 2.0.4, QMidi allows you to save the DLS synth volume "compensation" (offset) in the music device setup window. You can boost the volume as needed and save your changes by clicking the "Save Preset" button: